BUZZ-Gold, silver producers: Gold set for first weekly gain in four
** Mid-size gold and silver producers up, as political uncertainty in Greece boosted demand for assets seen as safe
** Gold was set for first weekly gain in four weeks
** Spot gold was up marginally by 1506 GMT after rising to session high of $1,217.30 an ounce
** Silver was up 1.2 pct at $16.51 an ounce
** Harmony Gold Mining Co shares rise 8.3 pct to $2.54, Kinross Gold Corp 5.5 pct to C$4.05, Gold Fields Ltd 5.6 pct to $5.49
** Seabridge Gold Inc shares rise 5.4 pct to C$10.71, AuRico Gold Inc 5.3 pct to C$4.56, Yamana Gold Inc 5 pct to C$5.26, Sibanye Gold Ltd 4.7 pct to $8.99
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